friction angle of soil (ϕ’)? Also find out the failure plane angle (Ѳ) in this case? c. Find the normal stress Ϭ’ and the shear stress Ƭ on

Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter9: Consolidation
Section: Chapter Questions
Problem 9.20CTP
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A consolidated-drained triaxial test was conducted on a normally consolidated clay. The
results are, Ϭ3 = 300 kN/m2, (ΔϬd)f = 250 kN/m2. Determine? Draw a neat Mohr Circle to a
convenient scale and determine following?
a. Angle of friction ϕ’?
b. Derive a relation between angle Ѳ (that the failure plane makes with the major
principal plane) and internal friction angle of soil (ϕ’)? Also find out the failure plane
angle (Ѳ) in this case?
c. Find the normal stress Ϭ’ and the shear stress Ƭ on the failure plane?
d. Determine the effective normal stress on the plane of maximum shear stress and
orientation of this plane?
e. Determine the orientation of both major and minor principal planes?

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